From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Anchal Agarwal <anchalag@amazon.com>,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
hpa@zytor.com, x86@kernel.org, jgross@suse.com,
linux-pm@vger.kernel.org, linux-mm@kvack.org, kamatam@amazon.com,
sstabellini@kernel.org, konrad.wilk@oracle.com,
roger.pau@citrix.com, axboe@kernel.dk, davem@davemloft.net,
rjw@rjwysocki.net, len.brown@intel.com, pavel@ucw.cz,
peterz@infradead.org, eduval@amazon.com, sblbir@amazon.com,
xen-devel@lists.xenproject.org, vkuznets@redhat.com,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
dwmw@amazon.co.uk, benh@kernel.crashing.org
Subject: Re: [PATCH 03/12] x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume
Date: Sat, 30 May 2020 19:02:01 -0400 [thread overview]
Message-ID: <72989b50-0c13-7a2b-19e2-de4a3646c83f@oracle.com> (raw)
In-Reply-To: <529f544a64bb93b920bf86b1d3f86d93b0a4219b.1589926004.git.anchalag@amazon.com>
On 5/19/20 7:25 PM, Anchal Agarwal wrote:
> Introduce a small function which re-uses shared page's PA allocated
> during guest initialization time in reserve_shared_info() and not
> allocate new page during resume flow.
> It also does the mapping of shared_info_page by calling
> xen_hvm_init_shared_info() to use the function.
>
> Signed-off-by: Anchal Agarwal <anchalag@amazon.com>
> ---
> arch/x86/xen/enlighten_hvm.c | 7 +++++++
> arch/x86/xen/xen-ops.h | 1 +
> 2 files changed, 8 insertions(+)
>
> diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c
> index e138f7de52d2..75b1ec7a0fcd 100644
> --- a/arch/x86/xen/enlighten_hvm.c
> +++ b/arch/x86/xen/enlighten_hvm.c
> @@ -27,6 +27,13 @@
>
> static unsigned long shared_info_pfn;
>
> +void xen_hvm_map_shared_info(void)
> +{
> + xen_hvm_init_shared_info();
> + if (shared_info_pfn)
> + HYPERVISOR_shared_info = __va(PFN_PHYS(shared_info_pfn));
> +}
> +
AFAICT it is only called once so I don't see a need for new routine.
And is it possible for shared_info_pfn to be NULL in resume path (which
is where this is called)?
-boris
next prev parent reply other threads:[~2020-05-30 23:04 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-19 23:24 [PATCH 00/12] Fix PM hibernation in Xen guests Anchal Agarwal
2020-05-19 23:24 ` [PATCH 01/12] xen/manage: keep track of the on-going suspend mode Anchal Agarwal
2020-05-30 22:26 ` Boris Ostrovsky
2020-06-01 21:00 ` Agarwal, Anchal
2020-06-01 22:39 ` Boris Ostrovsky
2020-05-19 23:25 ` [PATCH 02/12] xenbus: add freeze/thaw/restore callbacks support Anchal Agarwal
2020-05-30 22:56 ` Boris Ostrovsky
2020-06-01 23:36 ` Agarwal, Anchal
2020-05-19 23:25 ` [PATCH 03/12] x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume Anchal Agarwal
2020-05-30 23:02 ` Boris Ostrovsky [this message]
2020-06-04 23:03 ` Anchal Agarwal
2020-06-05 21:39 ` Boris Ostrovsky
2020-06-08 16:52 ` Anchal Agarwal
2020-06-08 18:49 ` Boris Ostrovsky
2020-05-19 23:26 ` [PATCH 04/12] x86/xen: add system core suspend and resume callbacks Anchal Agarwal
2020-05-30 23:10 ` Boris Ostrovsky
2020-06-03 22:40 ` Agarwal, Anchal
2020-06-05 21:24 ` Boris Ostrovsky
2020-06-08 17:09 ` Anchal Agarwal
2020-05-19 23:26 ` [PATCH 05/12] genirq: Shutdown irq chips in suspend/resume during hibernation Anchal Agarwal
2020-05-19 23:29 ` Singh, Balbir
2020-05-19 23:36 ` Agarwal, Anchal
2020-05-19 23:34 ` Anchal Agarwal
2020-05-30 23:17 ` Boris Ostrovsky
2020-06-01 20:46 ` Agarwal, Anchal
2020-05-19 23:27 ` [PATCH 06/12] xen-blkfront: add callbacks for PM suspend and hibernation Anchal Agarwal
2020-05-20 5:00 ` kbuild test robot
2020-05-20 5:07 ` kbuild test robot
2020-05-21 23:48 ` Anchal Agarwal
2020-05-22 1:43 ` Singh, Balbir
2020-05-23 12:32 ` kbuild test robot
2020-05-28 12:30 ` Roger Pau Monné
2020-05-19 23:28 ` [PATCH 07/12] xen-netfront: " Anchal Agarwal
2020-05-19 23:28 ` [PATCH 08/12] xen/time: introduce xen_{save,restore}_steal_clock Anchal Agarwal
2020-05-30 23:32 ` Boris Ostrovsky
2020-05-19 23:28 ` [PATCH 09/12] x86/xen: save and restore steal clock Anchal Agarwal
2020-05-30 23:44 ` Boris Ostrovsky
2020-06-04 18:33 ` Anchal Agarwal
2020-05-19 23:29 ` [PATCH 10/12] xen: Introduce wrapper for save/restore sched clock offset Anchal Agarwal
2020-05-19 23:29 ` [PATCH 11/12] xen: Update sched clock offset to avoid system instability in hibernation Anchal Agarwal
2020-05-19 23:29 ` [PATCH 12/12] PM / hibernate: update the resume offset on SNAPSHOT_SET_SWAP_AREA Anchal Agarwal
2020-05-28 17:59 ` [PATCH 00/12] Fix PM hibernation in Xen guests Agarwal, Anchal
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